Portable cooler



FIG. 1 is a view in perspective of a portable cooler, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is another view in perspective thereof showing the front, bottom and left side faces thereof. 

The ornamental design for a portable cooler, as shown and described. 